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Pulse current electrodeposition and corrosion properties of Ni–W alloy coatings

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Abstract

Ni–W alloy coatings were prepared on a mild steel substrate by means of pulse current (PC) and compared to the coatings electrodeposited by direct current (DC). In particular the study dealt with the influence of the frequency using pulse current on the surface morphology while maintaining a constant duty cycle. A constant charge for DC and PC electrodeposition of Ni–W alloy coatings was used. The morphology of the coatings was explored by scanning electron microscopy and the composition of the coatings was analysed by X-ray powder diffraction and energy dispersive X-ray analysis. Corrosion resistance of Ni–W alloy coatings was investigated by potentiodynamic polarization in a chloride medium. The corrosion products were analysed by Raman spectroscopy. It was found that the temperature of the electrolysis affects current efficiency of the DC and PC electrodeposition. The frequency of pulse electrodeposition alters the morphology of the Ni–W alloy coatings. There was evidence of the positive influence of increased tungstate concentration in the electrolyte on corrosion resistance of the Ni–W alloy coatings.

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Acknowledgement

The financial support of the Slovak Grant Agency research projects 1/0535/08 and 1/0579/10 is greatly acknowledged. M. Zemanová appreciates proof reading by K. Boehling (TU Darmstadt).

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Authors and Affiliations

  1. Department of Inorganic Technology in Bratislava, STU in Bratislava, Radlinského 9, 81237, Bratislava, Slovakia

    M. Zemanová, M. Krivosudská, M. Chovancová & V. Jorík

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  1. M. Zemanová
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  2. M. Krivosudská
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  3. M. Chovancová
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  4. V. Jorík
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Correspondence to M. Zemanová.

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Zemanová, M., Krivosudská, M., Chovancová, M. et al. Pulse current electrodeposition and corrosion properties of Ni–W alloy coatings. J Appl Electrochem 41, 1077–1085 (2011). https://doi.org/10.1007/s10800-011-0331-y

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  • DOI: https://doi.org/10.1007/s10800-011-0331-y

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